匿名Formatting Tree Nodes
This example shows how to display extra information on nodes.
示例：
代码：
<div class="easyui-panel" style="padding:5px">
<ul class="easyui-tree" data-options="
url:'examples/tree/tree_data1.json',
method:'get',
animate:true,
formatter:function(node){
var s = node.text;
if (node.children){
s += ' <span style=\'color:blue\'>(' + node.children.length + ')</span>';
}
return s;
}
">
</ul>
</div>